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David Tepper’s Appaloosa cut its stake to 540,000 shares at the end of March, a 41% reduction from three months earlier, according to a Securities and Exchange Commission filing.

Julian Robertson’s Tiger Management had exited Apple by the end of March, according to a SEC filing. Tiger Management had owned 42,125 shares at the end of December.

Apple stock shed 17% in the first quarter following a loss of 20% in the fourth quarter of 2012.

$ZNGA: Zynga Inc.
ZNGA, -0.28%
shares jumped more than 4%. Barry Rosenstein’s Jana Partners LLC bought 25.5 million shares in the social gaming company valued at $85.6 million as of end of March, according to a SEC regulatory filing. Jana also bought 22 million shares of Groupon Inc.
GRPN, +0.23%
worth $134.3 million in the first quarter. The stock initially rallied but closed the session down 0.4%.

$GOOG: Google Inc.
GOOG, +0.81%
shares advanced 3.3% to top $900 for the first time ever as it hosted a developer conference. Google debuted new features for its Android and Chrome operating systems and a new streaming music subscription service.

$BBRY: BlackBerry
US:BBRY
shares lost 1.6%. The stock was downgraded to market perform from outperform at Bernstein Research.

“With BlackBerry Live behind us, we don’t see additional positive catalysts coming through in the next 6 months to drive valuation closer to a successful transition scenario,” said Pierre Ferragu at Bernstein in a report.

Chief Executive Thorsten Heins unveiled a new lower-priced smartphone featuring the BlackBerry 10 platform and targeting emerging markets at the company’s annual BlackBerry Live conference. The smartphone maker is also expected to make available its BlackBerry Messenger service to users of iPhones and Androids, free of charge.

Eastman Chemical Co.
EMN, +0.80%
shares advanced 5%. Eastman’s board on Tuesday said it appointed Vice President Mark Costa as president, effective immediately. He will also take over as chief executive officer on Jan. 1, 2014.

Decliners

Cliffs Natural Resources Inc.
CLF, -2.71%
shares declined 5.2%. The stock of the mining company has been pressured due to worries about slowing growth in China, a big consumer of raw materials.

Computer Sciences Corp.
US:CSC
shares slumped 9.7%. The information-technology company on Wednesday said it swung to a profit in the fourth quarter but its revenue fell 7.3% .

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